On Aug 26, 2007, at 11:01 , Fabio Filasieno wrote:

> collection := OrderedCollection new.
> collection add:1.
>
> evaluates to one. Why ? Why not to collection ?

You do not always add a simple value but the result of an expression.  
Having the #add: return the argument sometimes lets you avoid  
introducing a temporary variable. It is more useful this way, and for  
the cases where you actually want the collection you can use a cascade.

A similar point can be made that setters should return the argument  
instead of the receiver, although usually in Squeak they do not  
(Tweak revises that policy).

- Bert -